Herr C. auteur aut IRD Chapuis Lardy Lydie auteur aut IRD Dassonville N. auteur aut IRD Vanderhoeven S. auteur aut IRD Meerts P. auteur aut IRD text journalArticle eng Invasions by alien plants can alter biogeochemical cycles in recipient ecosystems. We test if Early Goldenrod (Solidago gigantea) alters P fractions. To that end, we compare invaded plots and adjacent, uninvaded resident vegetation for specific fractions of organic and inorganic P, phosphomonoesterase (PME) activity in topsoil, and immobilization of P in above- and belowground organs and in soil microbial biomass. Invaded plots had lower soil pH and 20%-30% higher labile P fractions (resin-P-i, bicarb-P-i, NaOH-Pi), and the difference was consistent across seasons. There was no difference in microbial P. Alkaline-PME activity was 30% lower in topsoil of invaded plots. Annual P uptake in aboveground phytomass was not markedly higher in Solidago. In contrast, P in belowground organs steadily increased in autumn in invaded plots, due to both increased biomass and increased P concentrations. This indicated higher net P immobilization in Solidago, far in excess of both resorption from senescing shoots and P requirements for aboveground biomass in subsequent year. Higher turnover rates of P in belowground organs and mobilization of sparingly soluble P forms through rhizosphere acidification may be involved in the observed differences in soil P status between invaded and uninvaded plots. specialized exotic species effects Early Goldenrod soil plant P cycling soil phosphorus availability microbial biomass P phosphomonoesterase 068 076 170 6 729-738 2007 1436-8730 https://www.documentation.ird.fr/hor/PAR00002355 10.1002/jpln.200625190 1436-8730 https://www.documentation.ird.fr/hor/PAR00002355 IRD - Base Horizon / Pleins textes 2008-05-30 2017-08-23 PAR00002355 fre